High-frequency wall heat flux measurement during wall impingement of a diffusion flame

被引:7
|
作者
Moussou, Julien [1 ,2 ]
Pilla, Guillaume [1 ]
Sotton, Julien [2 ]
Bellenoue, Marc [2 ]
Rabeau, Fabien [1 ]
机构
[1] IFP Energies Nouvelles, Inst Carnot IFPEN Transports Energie, Rueil Malmaison, France
[2] Univ Poitiers, Inst PPRIME, CNRS, ISAE,ENSMA, Chasseneuil, France
关键词
Diesel combustion; heat flux; high-frequency measurement; convection coefficient; LASER-INDUCED FLUORESCENCE; COMPRESSION-IGNITION; TEMPERATURE-MEASUREMENTS; CONVENTIONAL DIESEL; COMBUSTION; ENGINE; CYLINDER; PRESSURE; MODEL;
D O I
10.1177/1468087419878040
中图分类号
O414.1 [热力学];
学科分类号
摘要
The efficiency of internal combustion engines is limited by heat losses to the wall of the combustion chamber. A precise characterization of wall heat flux is therefore needed to optimize engine parameters. However, the existing measurements of wall heat fluxes have significant limitations; time resolution is often higher than the timescales of the physical phenomena of flame-wall interaction. Furthermore, few studies have investigated diesel flame conditions (as opposed to propagation flames). In this study, the heat flux generated by a diffusion flame impinging on a wall was measured with thin-junction thermocouple, with a time resolution of the whole acquisition chain better than 0.1 ms. The effects of variations in ambient gas temperature, injection pressure and injector-wall distance were investigated. Diesel spray impingement on the wall is shown to cause strong gas-wall thermal exchange, with convection coefficients of 6-12 kW/m(2)/K. Those results suggest the necessity of close-wall aerodynamic measurements to link macroscopic characteristics of the spray (injection pressure, impingement geometry) to turbulence values.
引用
收藏
页码:847 / 855
页数:9
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